The best books of the week

The quest to end ageing and death; the final part of Philip Pullman’s ‘Book of Dust’ trilogy; the rightward shift of Silicon Valley; a blueprint for British economic growth; the singular life of Peter Matthiessen; belatedly translated essays by Milan Kundera; Bora Chung’s tales of dystopian fantasy — plus Pilita Clark’s pick of four optimistic titles on climate change